Cannot get program to go to function

[psppb]

This is a game I used to enjoy playing in high school as immature as it is it's a good exercise in programming that will hopefully help me learn.

There is one function in this code that I cannot go into. Could someone answer me when I ask why?

Thanks

#include <stdio.h>
#include <stdlib.h> /* required for randomize() and random() */
#include <conio.h>  /* required for clrscr() */
#include <time.h> 


void Drug_buy(char city, double *my_money_ptr, int *my_coke_units_ptr, int *my_heroin_units_ptr, int *my_crack_units_ptr, int *my_pcp_units_ptr, int *my_acid_units_ptr, int *my_pot_units_ptr )
{
          srand(time(NULL));
          double coke_price = 30000 *(double)rand()/(double)RAND_MAX;
          double heroin_price = 5000 * (double)rand()/(double)RAND_MAX;
          double crack_price = 1000 *(double)rand()/(double)RAND_MAX;
          double pcp_price= 800 *(double)rand()/(double)RAND_MAX;
          double acid_price = 500 *(double)rand()/(double)RAND_MAX;
          double pot_price =100 *(double)rand()/(double)RAND_MAX;
      start_buy :  
          
      printf(" $s City Drug Prices\n", city);
      printf("--------------------------------\n");
      printf(" What do you want to buy?\n");
      printf("1: Coke at %d dollars per unit\n", coke_price);   
      printf("2: Heroin at %d dollars per unit\n", heroin_price);  
      printf("3: Crack at %d dollars per unit\n", crack_price);    
      printf("4: PCP at %d dollars per unit\n", pcp_price);  
      printf("5: Acid at %d dollars per unit\n", acid_price); 
      printf("6: pot at %d dollars per unit\n", pot_price); 
      
      
      int drug_choice_selection;
      char drug_choice[100];
      printf("How Much? \n");
                 
      fgets(drug_choice, sizeof(drug_choice), stdin);
      sscanf(drug_choice, "%d", &drug_choice_selection);  
      
 
   
           switch(drug_choice_selection)
           {
           case( '1' ):
           
                 int coke_choice;
                 char coke_Col_line[100];
                 printf("How Much? \n");
                 
                 fgets(coke_Col_line, sizeof(coke_Col_line), stdin);
                 sscanf(coke_Col_line, "%d", &coke_choice);
                 
                 if(coke_choice*coke_price > *my_money_ptr)
                 {
                 printf("You don't have enough Money!\n");
                 printf("Please try again.....\n");
                 goto start_buy;
                 }
                 else
                 {
                 *my_money_ptr = (*my_money_ptr - (coke_choice*coke_price));
                 *my_coke_units_ptr = coke_choice;
                 }
                 
                 
   
   
           case( '2' ):
                 
                 int heroin_choice;
                 char heroin_Col_line[100];
                 printf("How Much? \n");
                 
                 fgets(heroin_Col_line, sizeof(heroin_Col_line), stdin);
                 sscanf(heroin_Col_line, "%d", &heroin_choice);
                 
                 if(heroin_choice*heroin_price > *my_money_ptr)
                 {
                 printf("You don't have enough Money!\n");
                 printf("Please try again.....\n");
                 goto start_buy;
                 }
                 else
                 {
                 *my_money_ptr = (*my_money_ptr - (heroin_choice * heroin_price));
                 *my_heroin_units_ptr = heroin_choice;
                 }
   
   
           case( '3' ):
                 goto start_buy;
   
   
           case( '4' ):
                 goto start_buy;




           case( '5' ): 
                 goto start_buy;




           case( '6' ): 
                 goto start_buy;   


           case( '7'): 
                 goto start_buy;    
   
           default :
                   goto start_buy;
   
  /* try again */
   }   
          
     }
     










int main()
{
      int my_money;
	  int my_coke_units;
	  int my_heroin_units;
	  int my_crack_units;
	  int my_pcp_units;
	  int my_acid_units;
	  int my_pot_units;
    
      int days_left = 31;    
while(days_left > 0)
{
      printf(" Day %d of your quest. Where do you want to go\n", days_left);
      
      printf("----------------------------------------------\n");
      
      printf("1: Chicago\n");   
      printf("2: Detroit\n");  
      printf("3: Disneyland\n");    
      printf("4: Mexico City\n");  
      printf("5: Vatican City\n"); 
      printf("6: Columbo\n");
      
      int city_choice_selection;
      char city_choice[100];


                 
      fgets(city_choice, sizeof(city_choice), stdin);
      sscanf(city_choice, "%d", &city_choice_selection); 
      
      
      switch( city_choice_selection)
      {
      case( 1 ):   
       void Drug_buy(char city, int &my_money, int &my_coke_units, int &my_heroin_units, int &my_crack_units, int &my_pcp_units, int &my_acid_units, int &my_pot_units );         
       
       
       case( 2 ):
             
             
       case( 3 ):
             
       case( 4 ):


       default:
               printf("this is the default\n");
       }
days_left = days_left - 1;




}    




 
   system("pause");                     /* the fix for the collapsing window*/
    return (0);
}

[christop]

      case( 1 ):   
       void Drug_buy(char city, int &my_money, int &my_coke_units, int &my_heroin_units, int &my_crack_units, int &my_pcp_units, int &my_acid_units, int &my_pot_units );

This statement is not a function call, and in fact it shouldn't even compile (it's valid C++ but invalid C).

[Matticus]

Whew ... don't tell me this compiles for you ...

I'm wary to tred too deeply into this one, but a few things that are causing the problem:

// function definition
void Drug_buy(char city,
              double *my_money_ptr,  // <--- this data type doesn't match the function call
              int *my_coke_units_ptr,
              int *my_heroin_units_ptr,
              int *my_crack_units_ptr,
              int *my_pcp_units_ptr,
              int *my_acid_units_ptr,
              int *my_pot_units_ptr )

// function call
case( 1 ):   
void Drug_buy(char city,
              int &my_money,  // <--- this data type doesn't match the function definition
              int &my_coke_units,
              int &my_heroin_units,
              int &my_crack_units,
              int &my_pcp_units,
              int &my_acid_units,
              int &my_pot_units );

Furthermore, in the function call:
- You don't need to indicate the return type of the function (remove "void")
- You don't need the return type for the variables you are passing to the function
- There is no character variable 'city' in "main()"
- ... and even if there were, it would be a single character and not a string (character array)

Which means in that your function, this:

printf(" $s City Drug Prices\n", city);

... would not print a string. It would also not print a string because you have a typo (you meant "%s").

My advice would be to brush up on functions before continuing this program.

Also, when you start, type up small bits and make sure it compiles. Add a little more and make sure it compiles. Don't try to type it all out at once and then compile when you're done - this will make the whole process go much smoother.

[iMalc]

You don't do this to call other functions:

char *fgets(char * city_choice, int sizeof(city_choice), FILE * stdin);

or this:

int sscanf(const char * city_choice, const char * "%d", ... &city_choice_selection);

or this:

int printf(const char * "this is the default\n");

So what makes you think you need to do this?:

       void Drug_buy(char city, int &my_money, int &my_coke_units, int &my_heroin_units, int &my_crack_units, int &my_pcp_units, int &my_acid_units, int &my_pot_units );

Instead of just this?:

       Drug_buy(city, &my_money, &my_coke_units, &my_heroin_units, &my_crack_units, my_pcp_units, my_acid_units, my_pot_units);